How do I use VUs only on Second API call and not first one?

Grafana k6 OSS Support
1 
import http from "k6/http";
import { sleep } from "k6";

let accessToken = "YOUR_GITHUB_ACCESS_TOKEN";

export default function() {

  let query = `
    query FindFirstIssue {
      repository(owner:"grafana", name:"k6") {
        issues(first:1) {
          edges {
            node {
              id
              number
              title
            }
          }
        }
      }
    }`;

  let headers = {
    'Authorization': `Bearer ${accessToken}`,
    "Content-Type": "application/json"
  };

  let res = http.post("https://api.github.com/graphql",
    JSON.stringify({ query: query }),
    {headers: headers}
  );

  if (res.status === 200) {
    console.log(JSON.stringify(res.body));
    let body = JSON.parse(res.body);
    let issue = body.data.repository.issues.edges[0].node;
    console.log(issue.id, issue.number, issue.title);

    let mutation = `
      mutation AddReactionToIssue {
        addReaction(input:{subjectId:"${issue.id}",content:HOORAY}) {
          reaction {
            content
          }
          subject {
            id
          }
        }
    }`;

    res = http.post("https://api.github.com/graphql",
      JSON.stringify({query: mutation}),
      {headers: headers}
    );
  }
  sleep(0.3);
}

Here in this case, I want to add VUs only if the If block. How can i do that ?

3

Welcome @Meghana to k6 community, What you ask question which is not clear You can put first API call in setup functions and second API in default function.

import http from 'k6/http';
import { sleep } from 'k6';

let accessToken = 'YOUR_GITHUB_ACCESS_TOKEN';
let res;
let headers = {
    'Authorization': `Bearer ${accessToken}`,
    'Content-Type': 'application/json'
};

// this default function will be executed on once
export function setup() {
    let query = `query FindFirstIssue { repository(owner:"grafana", name:"k6") { issues(first:1) { edges { node { id number title } } } } }`;
    
    res = http.post('https://api.github.com/graphql',JSON.stringify({ query: query }),{headers: headers});
    if (res.status === 200) {
        console.log(JSON.stringify(res.body));
        let body = JSON.parse(res.body);
        let issue = body.data.repository.issues.edges[0].node;
        console.log(issue.id, issue.number, issue.title);
    }
}

// this default function will be executed by number of VUs from option 
export default function() {
    let mutation = `
        mutation AddReactionToIssue {
            addReaction(input:{subjectId:"${issue.id}",content:HOORAY}) {
            reaction {
                content
            }
            subject {
                id
            }
        }
    }`;
    res = http.post("https://api.github.com/graphql",JSON.stringify({query: mutation}),{headers: headers});
    sleep(3);
}